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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31515c7a604bc6aa5071b822fd1552e2de9d5fc4c98ef6f6fc56116a3d196453' 
  AND token = 'sfQEDiZEefDNBwNMsjswo+YUin4fZIoywUsr/lkivdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}